Garbage Disposal Etiquette
Our plumbing is in a stack; that is, anything that goes down your disposal, tub or sink may turn up in someone else’s if the lines are clogged. This has caused flooding and expensive repairs in the past.
Avoid this unpleasant eventuality by leaving these out of your garbage disposal:
Egg shells
Coffee grounds
Bacon fat and other fats
Pasta
Celery and other stringy vegetables
Also, please don’t flush wet wipes. They also clog the system.
Find more details here.